﻿<!DOCTYPE html>
<html>
<head>
  <title>State Chart With Incremental Saves</title>
  <!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
  <meta name="description" content="An editable finite state machine chart that saves incremental changes." />
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="../release/go.js"></script>
  <script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
  <script id="code">
    function init() {
      if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
      var $ = go.GraphObject.make;  // for conciseness in defining templates

      myDiagram =
        $(go.Diagram, "myDiagramDiv",  // must name or refer to the DIV HTML element
          {
            // have mouse wheel events zoom in and out instead of scroll up and down
            "toolManager.mouseWheelBehavior": go.ToolManager.WheelZoom,
            // support double-click in background creating a new node
            "clickCreatingTool.archetypeNodeData": { text: "new node" },
            "InitialLayoutCompleted": function(e) { showIncremental("InitialLayout"); },
            "ModelChanged": function(e) {
              if (e.isTransactionFinished) {
                // this records each Transaction as a JSON-format string
                showIncremental(myDiagram.model.toIncrementalJson(e));
              }
            },
            // enable undo & redo
            "undoManager.isEnabled": true
          });

      // when the document is modified, add a "*" to the title and enable the "Save" button
      myDiagram.addDiagramListener("Modified", function(e) {
        var button = document.getElementById("SaveButton");
        if (button) button.disabled = !myDiagram.isModified;
        var idx = document.title.indexOf("*");
        if (myDiagram.isModified) {
          if (idx < 0) document.title += "*";
        } else {
          if (idx >= 0) document.title = document.title.substr(0, idx);
        }
      });

      // define the Node template
      myDiagram.nodeTemplate =
        $(go.Node, "Auto",
          new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
          // define the node's outer shape, which will surround the TextBlock
          $(go.Shape, "RoundedRectangle",
            {
              parameter1: 20,  // the corner has a large radius
              fill: $(go.Brush, "Linear", { 0: "rgb(254, 201, 0)", 1: "rgb(254, 162, 0)" }),
              stroke: "black",
              portId: "",
              fromLinkable: true,
              fromLinkableSelfNode: true,
              fromLinkableDuplicates: true,
              toLinkable: true,
              toLinkableSelfNode: true,
              toLinkableDuplicates: true,
              cursor: "pointer"
            }),
          $(go.TextBlock,
            {
              font: "bold 11pt helvetica, bold arial, sans-serif",
              editable: true  // editing the text automatically updates the model data
            },
            new go.Binding("text", "text").makeTwoWay())
        );

      // unlike the normal selection Adornment, this one includes a Button
      myDiagram.nodeTemplate.selectionAdornmentTemplate =
        $(go.Adornment, "Spot",
          $(go.Panel, "Auto",
            $(go.Shape, { fill: null, stroke: "blue", strokeWidth: 2 }),
            $(go.Placeholder)  // this represents the selected Node
          ),
          // the button to create a "next" node, at the top-right corner
          $("Button",
            {
              alignment: go.Spot.TopRight,
              click: addNodeAndLink  // this function is defined below
            },
            $(go.Shape, "PlusLine", { desiredSize: new go.Size(6, 6) })
          ) // end button
        ); // end Adornment

      // clicking the button inserts a new node to the right of the selected node,
      // and adds a link to that new node
      function addNodeAndLink(e, obj) {
        var adorn = obj.part;
        e.handled = true;
        var diagram = adorn.diagram;
        diagram.startTransaction("Add State");

        // get the node data for which the user clicked the button
        var fromNode = adorn.adornedPart;
        var fromData = fromNode.data;
        // create a new "State" data object, positioned off to the right of the adorned Node
        var toData = { text: "new" };
        var p = fromNode.location.copy();
        p.x += 200;
        toData.loc = go.Point.stringify(p);  // the "loc" property is a string, not a Point object
        // add the new node data to the model
        var model = diagram.model;
        model.addNodeData(toData);

        // create a link data from the old node data to the new node data
        var linkdata = {
          from: model.getKeyForNodeData(fromData),  // or just: fromData.id
          to: model.getKeyForNodeData(toData),
          text: "transition"
        };
        // and add the link data to the model
        model.addLinkData(linkdata);

        // select the new Node
        var newnode = diagram.findNodeForData(toData);
        diagram.select(newnode);

        diagram.commitTransaction("Add State");

        // if the new node is off-screen, scroll the diagram to show the new node
        diagram.scrollToRect(newnode.actualBounds);
      }

      // replace the default Link template in the linkTemplateMap
      myDiagram.linkTemplate =
        $(go.Link,  // the whole link panel
          {
            curve: go.Link.Bezier, adjusting: go.Link.Stretch,
            reshapable: true, relinkableFrom: true, relinkableTo: true
          },
          new go.Binding("points").makeTwoWay(),
          new go.Binding("curviness", "curviness"),
          $(go.Shape,  // the link shape
            { strokeWidth: 1.5 }),
          $(go.Shape,  // the arrowhead
            { toArrow: "standard", stroke: null }),
          $(go.Panel, "Auto",
            $(go.Shape,  // the label background, which becomes transparent around the edges
              {
                fill: $(go.Brush, "Radial",
                  { 0: "rgb(240, 240, 240)", 0.3: "rgb(240, 240, 240)", 1: "rgba(240, 240, 240, 0)" }),
                stroke: null
              }),
            $(go.TextBlock, "transition",  // the label text
              {
                textAlign: "center",
                font: "10pt helvetica, arial, sans-serif",
                stroke: "black",
                margin: 4,
                editable: true  // editing the text automatically updates the model data
              },
              new go.Binding("text", "text").makeTwoWay())
          )
        );

      // read in the JSON-format data from the "mySavedModel" element
      load();
    }

    // Show the diagram's model in JSON format
    function save() {
      document.getElementById("mySavedModel").value = myDiagram.model.toJson();
      myDiagram.isModified = false;
      showIncremental("");
    }
    function load() {
      var model = go.Model.fromJson(document.getElementById("mySavedModel").value);
      // establish GraphLinksModel functions:
      // node data id's are odd numbers
      model.makeUniqueKeyFunction = function(model, data) {
        var i = model.nodeDataArray.length * 2 + 1;
        while (model.findNodeDataForKey(i) !== null) i += 2;
        data.id = i;  // assume Model.nodeKeyProperty === "id"
        return i;
      };
      // link data id's are even numbers
      model.makeUniqueLinkKeyFunction = function(model, data) {
        var i = model.linkDataArray.length * 2 + 2;
        while (model.findLinkDataForKey(i) !== null) i += 2;
        data.id = i;  // assume GraphLinksModel.linkKeyProperty === "id"
        return i;
      };
      myDiagram.model = model;
      showIncremental("");
    }

    function showIncremental(str) {
      // show the last transaction as an incremental update in JSON-formatted text
      var element = document.getElementById("myTransaction");
      // don't show anything upon the initial layout
      if (element.value === "InitialLayout") str = "";
      element.value = str;
    }
  </script>
</head>
<body onload="init()">
<div id="sample">
  <div id="myDiagramDiv" style="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 400px"></div>
  <p>
  This sample is derived from the <a href="stateChart.html">State Chart</a> sample.
  This makes use of the new <a>GraphLinksModel.linkKeyProperty</a> property
  and the <a>Model.toIncrementalJson</a> and <a>Model.applyIncrementalJson</a> methods.
  It also demonstrates custom functions for <a>Model.makeUniqueKeyFunction</a> and
  <a>GraphLinksModel.makeUniqueLinkKeyFunction</a>, which assign odd numbers to new node
  data and even numbers to new link data.
  Unlike most models, this example uses "id" as the name of the <a>Model.nodeKeyProperty</a> rather than "key".
  </p>
  Last <a>Transaction</a> saved in incremental JSON format:
  <textarea id="myTransaction" style="width:100%;height:200px"></textarea>
  <button id="SaveButton" onclick="save()">Save</button>
  <button onclick="load()">Load</button>
  Diagram Model saved in JSON format:
  <br />
  <textarea id="mySavedModel" style="width:100%;height:300px">
{ "class": "go.GraphLinksModel",
  "nodeKeyProperty": "id",
  "linkKeyProperty": "id",
  "nodeDataArray": [
    { "id": 1, "loc": "120 120", "text": "Initial" },
    { "id": 3, "loc": "330 120", "text": "First down" },
    { "id": 5, "loc": "226 376", "text": "First up" },
    { "id": 7, "loc": "60 276", "text": "Second down" },
    { "id": 9, "loc": "226 226", "text": "Wait" }
  ],
  "linkDataArray": [
    { "id": 2, "from": 1, "to": 1, "text": "up or timer", "curviness": -20 },
    { "id": 4, "from": 1, "to": 3, "text": "down", "curviness": 20 },
    { "id": 6, "from": 3, "to": 1, "text": "up (moved)\nPOST", "curviness": 20 },
    { "id": 8, "from": 3, "to": 3, "text": "down", "curviness": -20 },
    { "id": 10, "from": 3, "to": 5, "text": "up (no move)" },
    { "id": 12, "from": 3, "to": 9, "text": "timer" },
    { "id": 14, "from": 5, "to": 1, "text": "timer\nPOST" },
    { "id": 16, "from": 5, "to": 7, "text": "down" },
    { "id": 18, "from": 7, "to": 1, "text": "up\nPOST\n(dblclick\nif no move)" },
    { "id": 20, "from": 7, "to": 7, "text": "down or timer", "curviness": 20 },
    { "id": 22, "from": 9, "to": 1, "text": "up\nPOST" },
    { "id": 24, "from": 9, "to": 9, "text": "down" }
  ]
}
</textarea>
</div>
</body>
</html>
